[issue23103] Reduce memory usage for ipaddress object instances

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> I believe you need to add a bunch of __slots__ = () to various base classes in the module, even though they lack member variables.

Done. Here is updated patch.

I don't think that IP addresses need weak references more than base types as integers or strings. Caching can be implemented without weak references (some caching already is used for networks), and I afraid that supporting weak references list will spent more memory than saved with caching.

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Added file: http://bugs.python.org/file37560/ipaddress_lightweight_2.patch

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